Hello, I am searching for the best option for chicken shipping boxes. Any suggestions are appreciated but most importantly I am wondering if there is a small box ideal for shipping a dozen or even 6 chicks. I have found them that hold 25 and obviously less will fit but I know when I buy from welp they have a 25 minimum because they say they need each other's body heat to survive shipping. If I did 6-12 would they be OK? Would I need to add a heat pack? What are the temperature Windows you all will ship in and when is extra heat needed? Thanks in advance for your help.